(19)

(11)

EP 0 743 891 A1

(12)

(43) Date of publication: 27.11.1996 Bulletin 1996/48 (21) Application number: 94910107.0 (22) Date of filing: 09.02.1994

(51) International Patent Classification (IPC):  B24B 21/ 00( . ) B24B 49/ 04( . ) (86) International application number: PCT/US1994/001454 (87) International publication number: WO 1995/021728 (17.08.1995 Gazette 1995/35)

(84) Designated Contracting States: DE FR GB IT (71) Applicant: Barton, Kenneth A. II Waterford, MI 48327 (US)	(72) Inventors: BARTON, Kenneth, A., II Waterford, MI 48327 (US) BOCHSLER, Rolf, O. Ann Arbor, MI 48103 (US) (74) Representative: Britter, Keith Palmer  Britter & Co Barn West - Dixies High Street - Ashwell Hertfordshire SG7 5NT High Street - Ashwell Hertfordshire SG7 5NT (GB)